Hub nut question...

[whaleys]

Hello all,

Are the hub nuts on the S2 Elise K-Series reversed thread for the passenger side? I thought they were and I was looking at buying some new ones and eliseparts doesn't seem to allow you to specify what type is required. The link is below...

http://www.eliseparts.com/products/show ... ft-hubnut/

If the are not how are they held in place? There doesn't seem to be any split pins or anything and I'm getting a little confused.

Thanks,
Graeme

[robin]

There should be a split pin or a pinched section of the nut.

It was only the early S1 that used left hand thread on pax side front wheels; that was because the torque on the weedy M10 couldn't be enough to stop it unwinding; on the later M16 type they're right handed. The driveshafts have, as far as I know, always been right handed.

Cheers
Robin

[Rich H]

Yep there is a recess to punch in the edge of the nut to lock it.

[whaleys]

Ah, thanks guys that makes sense, it looks like the type that Elise arts sell is the pinched nut type.

Not wanting to sound like a total noob but how do you 'pinch' a pinch nut?

Cheers,
Graeme

[Ferg]

I maybe wrong but isn't a pinch nut made to fit the thread and then squashed a little top to bottom as part of the manufacturing process. This means the thread is slightly out and has the effect of a lock nut without using nylon. Certainly on aeroplanes they're use once items, but not sure about car hubs though.

[robin]

Ferg: Pinch nut probably isn't the correct term for this nut, you're right. The exhaust manifold uses pinch nuts which have a slightly "wrong" thread so that they don't unwind.

If you look at the picture of the hub nut on the Elise parts site there is a cylindrical section at the top. There is a slot cut length ways into the driveshaft (i.e. perpendicular to the thread). Once you've done the hub nut up to FT (200+ Nm IIRC) then you use a chisel or similar to deform the cylindrical section so that it folds into the slot.

Cheers,
Robin

[whaleys]

Thanks all, that makes sense now.

Graeme

[whaleys]

Hi guys,

Confused again, I went on to eliseparts and they had the hub nut that I linked to which weren't right as i dont have the notch running perpendicular to the thread, its the type that take the split pin and castellated nut. So I went to elise-shop and they had nuts that are for a k-series Elise so thought great, I'll email to check they are castellated. I got a reply stating that they were and I phoned to double check and they said that its ok all k-series Elises take a 32mm nut and that's what they have in stock. So I thought perfect, I will order a pair and have a spare since delivery costs so much. They arrived yesterday and they are the same as the ones on eliseparts, not castellated, however they are 32mm. The issue now is that the current hub nuts that are on my elise are 30mm , so my question is are s2 k-series different and I was given duff info on the phone? or do I have different driveshafts on mine?

Cheers,
Graeme

[robin]

32mm is the socket size; so just 'cos one is 32mm and one 30mm doesn't matter so much as whether or not they are the same thread.

However, you should have a castellated nut if your driveshafts are the split pin type.

The easiest way of getting the correct nut is probably to call a Lotus dealer as they should be able to source both types.

Cheers,
Robin

[whaleys]

Thanks Robin,

The threads unfortunately are a different sizes, I will contact Lotus and see what I can get.

Thanks again for your advice,

Graeme